137708521651 has 4 divisors (see below), whose sum is σ = 144956338600. Its totient is φ = 130460704704.

The previous prime is 137708521627. The next prime is 137708521679. The reversal of 137708521651 is 156125807731.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 137708521651 - 2²⁹ = 137171650739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137708531651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3623908446 + ... + 3623908483.

It is an arithmetic number, because the mean of its divisors is an integer number (36239084650).

Almost surely, 2^137708521651 is an apocalyptic number.

137708521651 is a deficient number, since it is larger than the sum of its proper divisors (7247816949).

137708521651 is an equidigital number, since it uses as much as digits as its factorization.

137708521651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7247816948.

The product of its (nonzero) digits is 352800, while the sum is 46.

The spelling of 137708521651 in words is "one hundred thirty-seven billion, seven hundred eight million, five hundred twenty-one thousand, six hundred fifty-one".